Herbs, perennial, erect, (12-)15-20(-25) cm tall. Stems with 4 prominent and rounded angles, with scattered antrorsely (or sometimes also retrorsely) curved short hairs, more dense at nodes; internodes 1.5-4 cm at middle stem regions, longer or somewhat shorter than leaves. Leaves in whorls of 4; blade drying leathery, broadly lanceolate, (10-)15-25(-35) × (4.5-)6-7.5(-9) mm, length/breadth index (2-)2.5-3.5(-4), glabrous, adaxially papillose, abaxially without glandular idioblasts, base cuneate, margins revolute, antrorsely aculeolate, apex acute but not acuminate; 3 prominent principal veins extending into apex region. Inflorescences pyramidal, with cymes from middle to upper stem nodes and terminal, several to many flowered; axes glabrous, somewhat divaricate; peduncles mostly 1.5-4 cm; pedicels (0.5-)1-5 mm; bracts lanceolate, small and inconspicuous. Flowers hermaphroditic. Ovary obovoid, ca. 0.5 mm, glabrous, smooth. Corolla white to greenish, cup-shaped or campanulate, (2-)2.3-2.5(-2.7) mm in diam., fused at base for ± length of 4 free lobes, 0.8-1 mm, lanceolate, acute but not apiculate. Mericarps ovoid, 1.5-3 mm, glabrous and ± smooth. Fl. Jun-Aug, fr. Jul-Sep.
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